On Sun, 2020-01-05 at 23:41 +0100, Liam Proven via cctalk wrote: > On Sun, 5 Jan 2020 at 23:30, Guy Sotomayor via cctalk > <cctalk@classiccmp.org> wrote: > > > > Yes. We first started with Mach 3.0 build MK58. We did our final > > fork at MK68. We made some *significant* changes from what CMU > > had (things like changing mach messages from IPC to RPC) and a > > whole lot of work in the area of scheduling. > > Very interesting. If you are allowed to, you should blog about this > somewhere -- it is historic stuff.
Yea, unfortunately I've lost most of the historical documentation starting when we were all packed up to move from Boca Raton, FL to Austin, TX and then when I left IBM in 1997. I still have a set of the IBM Microkernel manuals (several 1000 pages that was all written in Framemaker) and I *may* still have a CD with the final set of sources on it (but where that might be would be an interesting question). > > > Yes, a lot of things were based on Mach. One OS that you're > > forgetting > > is OS X. That is based upon Mach 2.5. > > Well, firstly, no, I wasn't. I didn't mention OS X, or macOS as it's > called now, because it's based on NeXTstep. It's a later version of > the same OS. > > Secondly, AIUI, NeXTstep used Mach 2.5 but one of the changes in Mac > OS X 1.0 is that they moved to Mach 3 and updated the userland from > BSD 4.4-Lite to FreeBSD then-current, hiring Jordan Hubbard to do > much > of that work.. No OS X uses Mach 2.5. I worked in the kernel group at Apple for a number of years and am fairly familiar with the kernel. They may have pulled a few things from Mach 3.0, but it is still fundamentally Mach 2.5. > > > > MkLinux didn't get very far, either, did it? > > > > > > > I think that was the original Linux port for PPC. > > It was, and I think only on Apple hardware. There were a few dev > builds and then it disappeared, IIRC. > > [*Checkes*] > > Yup, OldWorld-ROM NuBus PowerMacs, and later OldWorld PCI PowerMacs > -- > but later Linux supported PCI Macs directly. > > There were apparently 4 "developer releases", an R1 and an unfinished > R2. Supplanted by Mac OS X, but apparently the Mach work really > helped > to get NeXTstep and "Rhapsody" bootstrapped on PowerMacs. > -- TTFN - Guy
